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I would suggest that you assume that the rules applied will be based on a strict interpretation of the IPMS / USA National Rules for Competition. (Which is not what actually occurs at most local IPMS / USA shows, just what is the best attitude to approach them with.)
Most local IPMS shows don't bother re-writing the entire rules set and only publish exceptions or changes to the National Rules (if they even do that much). If you're traveling any distance and don't know the members of the hosting chapter, then your best bet is to expect a strict interpretation of the rules by the head judge. However, it's not the written rules that will get you, it's the un-written ones!
The problems and bad feelings that often result after many local IPMS shows usually come from the many, many on-the-spot exceptions and allowances that are granted and allowed by the head judge and other hosting chapter members, most often for those local attendees that have some relationship with the hosting chapter.
In short, at most any given IPMS / USA show, you just don't know what you're gonna get until after the show. Hope for the best, but be mentally prepared for the worst. With enough time and local IPMS shows under your belt, you'll never be suprised by what might happen, especially at venues with hosting chapters that you're not familiar with.
You never find out what the "house rules" are until you walk through the door, and the locals always have a "home field advantage."